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Geographic and Service Group Information (Geographic Revenue from Continuing Operations before Reimbursement) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement									$ 282,472	$ 285,887	$ 276,599
Revenue from Continuing Operations Before Reimbursement [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement	$ 63,736	$ 66,755	$ 67,976	$ 62,370	$ 61,595	$ 68,183	$ 68,706	$ 66,039	260,837	264,523	255,131
Revenue from Continuing Operations Before Reimbursement [Member] | North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement									221,823	222,054	211,195
Revenue from Continuing Operations Before Reimbursement [Member] | International (Primarily European Countries) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from continuing operations before reimbursement									$ 39,014	$ 42,469	$ 43,936

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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+ References

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